Configuration Guide 226
Configuring Layer 2 Multicast IGMP Snooping Configuration
Step 3 ip igmp snooping vlan-config
vlan-id-list
rtime
router-time
Specify the router port aging time for the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
router-time:
Specify the aging time of the router ports in the specified VLANs. Valid values are
from 60 to 600 seconds. By default, it is 300 seconds.
Once the switch receives an IGMP general query message from a port, the switch adds this
port to the router port list. Router ports that are learned in this way are called dynamic router
ports.
If the switch does not receive any IGMP general query message from a dynamic router port
within the router port aging time, the switch will no longer consider this port as a router port
and delete it from the router port list.
Step 4 ip igmp snooping vlan-config
vlan-id-list
ltime
leave-time
Specify the router port aging time for the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
leave-time:
Specify the leave time for the VLAN(s). Valid values are from 1 to 30 in seconds,
and the default value is 1 second.
When the switch receives a leave message from a port to leave a multicast group, it will wait for
a leave time before removing the port from the multicast group. During the period, if the switch
receives any report messages from the port, the port will not be removed from the multicast
group. Exceptions are as follows:
•
If the member port ages out before the Leave Time ends and no report messages are
received, the port will be removed from the multicast group once its Member Port Aging
Time ends.
•
The Leave Time mechanism will not take effect when Fast Leave takes effect.
A proper leave time value can avoid other hosts connecting to the same port of the switch
being mistakenly removed from the multicast group when only some of them want to leave.
Step 5 ip igmp snooping vlan-config
vlan-id-list
report-suppression
(Optional) Enable the Report Suppression for the VLANs. By default, it is disabled.
When enabled, the switch will only forward the first IGMP report message for each multicast
group to the IGMP querier and suppress subsequent IGMP report messages for the same
multicast group during one query interval. This feature prevents duplicate report messages
from being sent to the IGMP querier.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
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